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(15+x)/30=2/1
We move all terms to the left:
(15+x)/30-(2/1)=0
We add all the numbers together, and all the variables
(x+15)/30-0=0
We add all the numbers together, and all the variables
(x+15)/30=0
We multiply all the terms by the denominator
(x+15)=0
We get rid of parentheses
x+15=0
We move all terms containing x to the left, all other terms to the right
x=-15
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